Bugzilla Bug 152839

Changes Prior to 2.5.5 release
    -   Don't #include linux/blkpg.h as that isn't safe.  Just
        include the content literally.
    -   Reduce maximum bitmap usage when working with bitmap files,
        so that a only single-page allocations are made, even on
        64bit hosts with 4K pages.
    -   Close stray fd in mdassemble so that it can assemble stacked
        devices
    -   If mdassemble finds an array already assembled, it marks it
        read-write.
    -   Remove error in md_open if array is already active.  This isn't
        needed and gets in the ways if an array was created e.g. in
        initramfs, but device doesn't yet exist in /dev.
    -   When --assemble --scan is run, if all arrays that could be found
        have already been started, don't report an error.
    -   Fix a couple of bugs related to raid10 and the new 'offset' layout.
    -   Improve error message when a wrong '--update' option is given.

thanks, now in portage